#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  for(int i=0;i<(n);++i)
#define FORq(i, m, n) for(int i = (m);i <= (n);++i)
#define SCD(n) scanf("%d",&n)
#define SCD2(m,n) scanf("%d%d",&m,&n)
#define SCD3(m,n,k) scanf("%d%d%d",&m,&n,&k)
#define PB push_back
#define MP make_pair
#define ARSCD(A,N) REP(i,N){SCD(A[i]);}
#define ARSCD1(A,N) FORq(i,1,N){SCD(A[i]);}
#define PRINTD(n) printf("%d\n",n)
#define PRINTLLD(n) printf("%lld\n",n)
#define DEBUG printf("%s\n","debug")
#define fst first
#define snd second
#define IN(x,S) (S.count(x) != 0)
using namespace std;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef long long ll;
//////////////////////////////////////////////////////

int main(){
	int X,Y;
	SCD2(X,Y);

	vector<PII>Q;
	Q.PB(MP(-2,-1));
	Q.PB(MP(-2,1));
	Q.PB(MP(-1,-2));
	Q.PB(MP(-1,2));
	Q.PB(MP(1,-2));
	Q.PB(MP(1,2));
	Q.PB(MP(2,-1));
	Q.PB(MP(2,1));
	
	REP(i,8){
		PII xy = Q[i];
		int x = xy.fst;
		int y = xy.snd;
		
		Q.PB(MP(x-2,y-1));
		Q.PB(MP(x-2,y+1));
		Q.PB(MP(x-1,y-2));
		Q.PB(MP(x-1,y+2));
		Q.PB(MP(x+1,y-2));
		Q.PB(MP(x+1,y+2));
		Q.PB(MP(x+2,y-1));
		Q.PB(MP(x+2,y+1));
	}
	
	REP(i,64){
		PII xy = Q[i+8];
		int x = xy.fst;
		int y = xy.snd;
		
		Q.PB(MP(x-2,y-1));
		Q.PB(MP(x-2,y+1));
		Q.PB(MP(x-1,y-2));
		Q.PB(MP(x-1,y+2));
		Q.PB(MP(x+1,y-2));
		Q.PB(MP(x+1,y+2));
		Q.PB(MP(x+2,y-1));
		Q.PB(MP(x+2,y+1));
	}
	
	
	REP(i,512){
		PII xy = Q[i];
		int x = xy.fst;
		int y = xy.snd;
		
		if ((x==X) and (y==Y)){
			printf("YES\n");
			return 0;
		}
		
	}
		
	printf("NO\n");
	return 0;
}